RT Dissertation/Thesis
T1 Multi-particle production in the Color Glass Condensate
A1 Agostini Infante, Pedro Augusto
K1 QCD
K1 CGC
K1 Particle correlation
K1 Particle production
K1 High Energy Physics
AB In this thesis, we review the framework of multi-particle production in high energy collisionswithin the Color Glass Condensate effective theory. The main goal of this workis to provide a systematic basis for performing analysis on particle correlation both inproton-proton, pp, and in proton-nucleus, pA, scatterings such as those studied at theLHC or RHIC.We provide the basic aspects of the high energy, or small-x, limit of Quantum Chromodynamics(QCD) and we introduce the Color Glass Condensate (CGC). We providethe technical approach for studying particle production in high energy collisions at leadingorder in the QCD coupling constant. We review the phenomenon of particle correlationthat has been seen in pp and pA collisions and we explain it from first principles withinthe CGC framework.On the other hand, based on [38], we generalize the usual approach for analyzingparticle production at leading order within the CGC framework to the case in which anarbitrary number of particles are produced. We introduce and study the so-called AreaEnhancement model which offers a simple alternative for evaluating high order Wilsonlines correlators. We mimic the Gaussian ansatz of the Wigner distribution approachfor studying multi-particle correlations but we break the usual factorization assumption.We compute the 4-particle cumulant, c2{4}, and we obtain a negative value which agreesqualitatively with data.Finally, based on [45,46], we introduce sub-eikonal corrections to the dilute-dilute, orGlasma Graph, limit of the CGC by including finite width effects. We study the effectsof non-eikonal corrections in single, double and triple gluon production. We see thatthe sub-eikonal effects introduces an asymmetry in the azimuthal distribution of gluonsand therefore is able to explain the appearance of odd azimuthal harmonics in data. Weperform a numerical study of the non-eikonal effects and see that they are negligible atrelatively high energies. We generalize our approach to the dilute-dense limit, which ismore suitable for pA collisions, by introducing the dense medium propagator, analogouslyto the jet quenching framework. We introduce a systematic approach for computing multigluonproduction in proton-nucleus collisions beyond the eikonal accuracy. We study theodd azimuthal harmonics generated in this approach.
YR 2021
FD 2021
LK http://hdl.handle.net/10347/27209
UL http://hdl.handle.net/10347/27209
LA eng
DS Minerva
RD 27 abr 2026